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R. MONTGGMERY, OF NEy YORK, N. Y.

IRON PAVEMENT.

Specification of Letters Patent No. 22,444, dated December 28, 1858.

To aZZ whom "it 'may concern:

Be it known that I, RICHARD MONTGOMERY, of the city and county of NewYork, in the State of New York, have invented a new and usefulImprovement in Iron Pavements for Streets; and I do hereby declare thatthe following is a full description thereof.

To enable those skilled in the art to which my improvement belongs toconstruct and use my improvement I will now proceed to describe thesame, reference being had to the annexed drawings and to the letters ofreference marked thereon, forming a part of this specification.

In these drawings Figure l represents a perspective view of the archwhich this pavement forms across the street; Fig. 2, represents alongitudinal and Fig. 3, a cross section of one of these arches; Fig.4l, exhibits a portion of the ribbed surface of this pavement on a largescale; Fi 5, represents a modification of the plan o joining the archplates as shown in Fig. l; Fig. 6, is a perspective view of one of the.inner corners of one of the arch plates; Fig. 7, is a top View of partof two arch plates when interlocked by means of dovetails.

It will be seen from Fig. l, that my pavement, when in place, resemblesa continuous iron bridge, the curbstones m, m, answering as abutments tosupport the same. In this way but little weight is allowed to rest orbear at any one point upon the ground or earthen roadway.

The accompanying drawings represent the arches as being formed of twoplates (A, B,) each, meeting in the center of the street on the line p,Q. Each arch however might be formed of one plate only reaching fromcurbstone to curbstone, without the central joint. The plate B, isprovided with a vertical Hange Z), c, along its inner edge. This flangehas a horizontal rib e, which projects beyond the edge of the plate B,and serves to support the inner edge of the other plate A.. The flangehas another horizontal rib f, eX- tending backward for the purpose ofstrengthening the flange. The portions Z), c, of the flange projectsbeyond both edges Z, Z, of the arch, while the portion c, f, of theflange does not reach quite to the edges Z, Z, of the arch, thus forminga recess 5 1" c. at each end of the flange. The next arch which isintended to join the arch represented in Fig. l, would be similarlyconstructed, with the only exception that in that arch the ends of theportion c, f, of the flange would project beyond the edge of that archand the ends of the portion b, c, of the flange will stop'short of theedge of the arch. Thus the ends of the flange of each arch are made tointerlock with the ends of the-flanges of the adjoining arches.

The curbstone edge of each plate is provided with a llat horizontal faces, and a vertical flange i, the vertical flange to abut against thecurbstone my, and the face s, to rest upon wooden sleepers ZL, g, whichare laid along the curbstone the whole length of the street. Thecurbstone ends of the plates may be spiked to these sleepers ifdesirable, and may also be provided with suitable holes to permit thewater to run olf into the sewers. Similar sleepers CZ, run along thecenter of the streetv and are properly grooved to receive the flangesZ), c, of the plates B.

The plates are covered with arched cor rugations a, a, which are allparallel and run across the street. The body of the corrugation isthicker on top as represented at a, 0;, Fig. t. The ends of thecorrugations instead of meeting in one line may be made to interlock asrepresented in Figs. 5, and 7. If arranged on the plan last mentionedtwo or more of the corrugations of each plate may be dovetailed asrepresented at k, Fig. 7, for the purpose of uniting each two plates inthe most substantial way.

On streets which are not very wide or over which only light vehicles aredriven, the vertical flange z', may be dispensed with and the plates beconstructed without it.

The space between the sleepers below the arches as well as the spacesbetween the top portion of the corrugations may be filled up withconcrete asrepresented at n, n, in Figs. 2, 3, and 4L, if desired. Thusa smooth and even surface will be produced, and the corrugatedironsurface is to a great eXtent protected from wear and tear.

In the modilied arrangement represented in Figs. 5, and 7 theinterlocking ends of the corrugations lie across the flange Z9, c, so asto be properly supported. The advantages of this arrangement are many,especially when streets are to be laid out over ma de ground or lightand yielding soil. Another great advantage of my pavement consists inits great durability. By forming the corrugations thicker on the upperface (see a, a, in Fig. 4,), and giving them a gentle curved or archedform, they resist great strain and at the same time will en` dure greatwear. This arched pavement presents an even surface for carriages,omnibuses and drays, to pass over with the ease of a rail road,withoutthe present enormous wear and tear and the unnecessary con`sumption of -so much horse power. Again, by constructing pavements aftermy plan, a

lirm foothold is always aiiorded for horses, A,

since even if the top of the corrugations be comes much worn, there willstill be suflicient space between the corrugations to receive the calhsof the horses shoe. There will be less liability of expansion andcontraction in my pavement, than in any other iron pavement with which Iam acquainted, inasmuch as the corrugations on the under side are alwaysilled with moist earth, and as the surface thus exposed is very great,the heat of the sun upon the small partexposed to its direct rays, iscounteracted to a great degree.

Having described my improved pavement,

what I claim as new in this application and desire .to secure by LettersPatent, is:

l. A metallic pavement consisting of a series of parallel archedcorrugations reaclr ing or extending from the curbstone on one side ofthe street to the curbstone on the other side, substantially as shownand described.

2. I also claim casting or making the upper parts of the corrugationsthicker than the lower parts, in the manner and for the purpose setforth.

3. I also claim supporting or anchoring the pavement, when it is cast insections, by a grooved central support as shown and described'.

4. I also claim the dovetailed recesses and projections 7o, incombination with the projection b, c, for the purpose of holding thepavement in place.

R. MONTGOMERY.

IVitnesses Enw. F. BROWN, Trios. I-I. DODGE.

